: The solution is saturated. It is at the exact point of precipitation.

Searching for the is a smart move—but the best key is the one that teaches you to think like a chemist. It doesn’t just confirm that AgI precipitates first; it shows you why the difference in (K_sp) values by seven orders of magnitude guarantees a clean separation. It warns you about concentration reversals and stoichiometry traps. And it prepares you for lab applications and exams alike.

The concentration of the precipitating reagent must be carefully managed to avoid co-precipitation. By focusing on the relationship between Kspcap K sub s p end-sub